// Numbas version: exam_results_page_options
{"name": "USSKL6-30-1 CC1a - Electronics Written Assessment (RESIT)", "metadata": {"description": "<p>SbE Electronics Resit Written Assessment</p>", "licence": "Creative Commons Attribution 4.0 International"}, "duration": 0, "percentPass": 0, "showQuestionGroupNames": false, "shuffleQuestionGroups": false, "showstudentname": false, "question_groups": [{"name": "Group", "pickingStrategy": "all-ordered", "pickQuestions": 1, "questionNames": ["", "", ""], "variable_overrides": [[], [], []], "questions": [{"name": "ElQ3 - Power & Frequency Response  - Randomised Variables Only", "extensions": [], "custom_part_types": [], "resources": [["question-resources/SbE_CC1_Q3ai.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3ai.png"], ["question-resources/SbE_CC1_Q3b.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3b.png"], ["question-resources/SbE_CC1_Q3d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3d.png"], ["question-resources/SbE_CC1_Q3c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3c.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}], "tags": [], "metadata": {"description": "<p>Question Covering AC power and frquency response</p>", "licence": "All rights reserved"}, "statement": "<h2 style=\"text-align: center;\">Power &amp; Frequency Response</h2>", "advice": "<p>see spread sheet</p>", "rulesets": {}, "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true}, "constants": [], "variables": {"Q3ai_f_S": {"name": "Q3ai_f_S", "group": "Q3a", "definition": "random(100 .. 150#10)", "description": "<p>Frequency (f<sub>s</sub>)</p>", "templateType": "randrange", "can_override": false}, "Q3ai_V_PP": {"name": "Q3ai_V_PP", "group": "Q3a", "definition": "random(5 .. 9#1)", "description": "<p>V<sub>P-P</sub></p>", "templateType": "randrange", "can_override": false}, "Q3ai_V_DC": {"name": "Q3ai_V_DC", "group": "Q3a", "definition": "random(-0.5 .. 0.5#0.2)", "description": "<p style=\"text-align: left;\">DC Offset</p>", "templateType": "randrange", "can_override": false}, "Q3ai_R_L": {"name": "Q3ai_R_L", "group": "Q3a", "definition": "random(50 .. 150#10)", "description": "<p>Load Resistor R<sub>L</sub></p>", "templateType": "randrange", "can_override": false}, "q3aii_f_s": {"name": "q3aii_f_s", "group": "Q3a", "definition": "random(33 .. 99#33)", "description": "<p>Frequency (f<sub>s</sub>)</p>", "templateType": "randrange", "can_override": false}, "q3aii_v_pp": {"name": "q3aii_v_pp", "group": "Q3a", "definition": "random(5 .. 5#1)", "description": "<p>V<sub>P-P</sub></p>", "templateType": "randrange", "can_override": false}, "Q3aii_R_L": {"name": "Q3aii_R_L", "group": "Q3a", "definition": "random(2000 .. 2000#1)", "description": "<p>R<sub>L</sub></p>", "templateType": "randrange", "can_override": false}, "Q3aii_t_rise": {"name": "Q3aii_t_rise", "group": "Q3a", "definition": "siground(dec(1/(Q3aii_t_rise_modifier*q3aii_f_s)),4)", "description": "", "templateType": "anything", "can_override": false}, "Q3aii_t_rise_modifier": {"name": "Q3aii_t_rise_modifier", "group": "Q3a", "definition": "random(3 .. 4#1)", "description": "<p>Modifier of t_rise</p>", "templateType": "randrange", "can_override": false}, "Q3aii_V_DC": {"name": "Q3aii_V_DC", "group": "Q3a", "definition": "random(1 .. 1#1)", "description": "<p>DC Offset</p>", "templateType": "randrange", "can_override": false}, "Q3b_R1": {"name": "Q3b_R1", "group": "Q3b", "definition": "random(3000 .. 3600#100)", "description": "", "templateType": "randrange", "can_override": false}, "Q3b_R2": {"name": "Q3b_R2", "group": "Q3b", "definition": "random(2000 .. 2000#1000)", "description": "", "templateType": "randrange", "can_override": false}, "Q3b_R3": {"name": "Q3b_R3", "group": "Q3b", "definition": "random(1800 .. 2000#500)", "description": "", "templateType": "randrange", "can_override": false}, "Q3b_R4": {"name": "Q3b_R4", "group": "Q3b", "definition": "random(10000 .. 20000#2000)", "description": "", "templateType": "randrange", "can_override": false}, "Q3b_VS": {"name": "Q3b_VS", "group": "Q3b", "definition": "random(12 .. 12#1)", "description": "", "templateType": "randrange", "can_override": false}, "Q3c_R_L": {"name": "Q3c_R_L", "group": "Q3d", "definition": "random(1 .. 3#1)", "description": "<p>Load Resistance (k&Omega;)</p>", "templateType": "randrange", "can_override": false}, "Q3c_C1": {"name": "Q3c_C1", "group": "Q3d", "definition": "random(1 .. 3#1)", "description": "<p>Smoothing Capacitor (uF)</p>", "templateType": "randrange", "can_override": false}, "Q3c_V_S": {"name": "Q3c_V_S", "group": "Q3d", "definition": "random(20 .. 23#1)", "description": "<p>Supply Voltage (V<sub>S</sub>)</p>", "templateType": "randrange", "can_override": true}, "Q3c_Z_BDV": {"name": "Q3c_Z_BDV", "group": "Q3d", "definition": "siground(dec(q3c_v_s*(3/20)),2)", "description": "<p>Zener Diode Reverse Breakdown Voltage (V)</p>", "templateType": "anything", "can_override": false}, "Q3d_C1": {"name": "Q3d_C1", "group": "Q4d", "definition": "random(10 .. 12#0.1)", "description": "<p>Capacitance C1</p>", "templateType": "randrange", "can_override": false}, "Q3d_L1": {"name": "Q3d_L1", "group": "Q4d", "definition": "random(170 .. 190#10)", "description": "<p>Inductance</p>", "templateType": "randrange", "can_override": false}, "Q3d_R_L": {"name": "Q3d_R_L", "group": "Q4d", "definition": "random(1 .. 5#4)", "description": "", "templateType": "randrange", "can_override": false}, "Q3d_V_S": {"name": "Q3d_V_S", "group": "Q4d", "definition": "random(1 .. 10#9)", "description": "", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [{"name": "Unnamed group", "variables": []}, {"name": "Q3b", "variables": ["Q3b_R1", "Q3b_R2", "Q3b_R3", "Q3b_R4", "Q3b_VS"]}, {"name": "Q3a", "variables": ["Q3ai_f_S", "Q3ai_R_L", "Q3ai_V_DC", "Q3ai_V_PP", "q3aii_f_s", "Q3aii_R_L", "Q3aii_t_rise", "Q3aii_t_rise_modifier", "Q3aii_V_DC", "q3aii_v_pp"]}, {"name": "Q3d", "variables": ["Q3c_R_L", "Q3c_C1", "Q3c_V_S", "Q3c_Z_BDV"]}, {"name": "Q4d", "variables": ["Q3d_C1", "Q3d_V_S", "Q3d_L1", "Q3d_R_L"]}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part a) Signal Waveforms</strong></p>\n<p>Draw or derive the voltage and current wave forms for the following:</p>\n<table width=\"919\" height=\"317\" style=\"height: 472px; width: 634px; border-style: solid; border-color: #000000;\">\n<tbody>\n<tr style=\"height: 33px; background-color: #c2c0c0; text-align: center;\">\n<td style=\"width: 84.25px; height: 33px; border-style: solid; border-color: #000000; background-color: #b5b5b5; vertical-align: middle; text-align: center;\">Waveform</td>\n<td style=\"width: 206.458px; height: 33px; border-style: solid; border-color: #000000; background-color: #b5b5b5; vertical-align: middle; text-align: center;\">\n<p>Varibles</p>\n</td>\n<td style=\"width: 292.958px; height: 33px; border-style: solid; border-color: #000000; background-color: #b5b5b5; vertical-align: middle; text-align: center;\">\n<p>Circuit</p>\n</td>\n</tr>\n<tr style=\"height: 247px;\">\n<td style=\"width: 84.25px; height: 247px; border-style: solid; border-color: #000000; text-align: left;\">i. Sinusoidal&nbsp;</td>\n<td style=\"width: 206.458px; height: 247px; border-style: solid; border-color: #000000; text-align: left;\">\n<p>R<sub>L</sub>: {Q3ai_R_L} &Omega;</p>\n<p>Frequency (f<sub>s</sub>): {Q3ai_F_S} Hz</p>\n<p>V<sub>P-P: </sub>{Q3ai_V_PP} V</p>\n<p>DC Offset (V<sub>DC</sub>): {Q3ai_V_DC} V</p>\n</td>\n<td style=\"width: 292.958px; height: 247px; border-style: solid; border-color: #000000; text-align: center;\">\n<p></p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q3ai.png\" alt=\"Simple Resistive Circuit\" width=\"221\" height=\"174\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n</td>\n</tr>\n<tr style=\"height: 192px;\">\n<td style=\"width: 84.25px; border-style: solid; border-color: #000000; height: 192px; text-align: left;\">ii. Triangular</td>\n<td style=\"width: 206.458px; border-style: solid; border-color: #000000; height: 192px; text-align: left;\">\n<p>R<sub>L</sub>: {Q3aii_R_L/1000} k&Omega;</p>\n<p>Frequency (f<sub>s</sub>): {Q3aii_F_S} Hz</p>\n<p>V<sub>P-P: </sub>{Q3aii_V_PP} V</p>\n<p>DC Offset (V<sub>DC</sub>): {Q3aii_V_DC} V</p>\n<p>t<sub>Rise</sub>: {Q3aii_t_rise*1000} ms</p>\n</td>\n<td style=\"width: 292.958px; border-style: solid; border-color: #000000; height: 192px; text-align: center;\">\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/SbE_CC1_Q3ai.png\" alt=\"Simple Resistive Circuit\" width=\"220\" height=\"173\"/></p>\n</td>\n</tr>\n</tbody>\n</table>\n<p></p>\n<p>SPICE Circuit suitable for analysis: <a href=\"https://www.multisim.com/content/5AuzGdcfbsojg9sJUUrxs9/sbe-cc1-q3a/open/\">SbE CC1 Q3a (multisim.com)</a></p>\n<p></p>\n<p><strong>[4Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part b) Power Calculation</strong></p>\n<p>The figure shows a resistor network connected to a Triangular Waveform source and the equations that can be used to convert between Star and Delta impedance configurations:</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q3b.png\" alt=\"Resistor Network and Star-Delta Conversion Equations\" width=\"832\" height=\"462\"/></p>\n<p><strong>Circuit Varibles:</strong>&nbsp;V<sub>S(peak)</sub> = {Q3b_VS}V, f = {100}Hz t<sub>rise</sub> = {2}ms Hz, R<sub>1</sub>= {siground(dec(Q3b_R1/1000),2)}k&Omega;, R<sub>2</sub>= {siground(dec(Q3b_R2/1000),2)}k&Omega;, R<sub>3</sub>= {siground(dec(Q3b_R3/1000),2)}k&Omega;, R<sub>4</sub>= {siground(dec(Q3b_R4/1000),2)}k&Omega;</p>\n<p>For the values given, calculate or determine the RMS power dissipated in the whole circuit and resistor R&shy;<sub>1</sub>.&nbsp;</p>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/cxrRsYAn36cgH8tuXAD4fo/sbe-cc1-q3b/open/\">*SbE CC1 Q3b (multisim.com)</a></p>\n<p><strong>[6Marks]</strong></p>\n<p></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part c) Power Supply</strong></p>\n<p>The figure shows a circuit designed for Voltage Reduction, Rectification and Regulation of an AC power source.&nbsp;</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q3c.png\" width=\"1001\" height=\"319\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Variables: </strong>V<sub>S</sub> = {Q3c_V_S}V<sub>RMS</sub>; C<sub>1</sub> = {Q3c_C1}mF; R<sub>1</sub>={1}&Omega;; R<sub>L</sub> = {Q3c_R_L}k&Omega;; T<sub>1</sub>: Turns on Primary Winding, &nbsp;N<sub>P</sub> = 20 and Secondary N<sub>S</sub> = 9;&nbsp; Diodes D<sub>1</sub> &amp; D<sub>2</sub>, Forward Bias Voltage = 860mV; Diode Z<sub>1</sub>, Reverse Breakdown Voltage = {Q3c_Z_BDV}V.&nbsp;&nbsp;</p>\n<p>For the component values given, explain how the circuit operates.&nbsp; Ensure that you:</p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Draw or derive the wave forms expected/observed at each of the stages (A, B C &amp; D).</li>\n<li>Explain why the wave form changes as it does and what role the components have and why they might have been chosen.</li>\n<li>Calculate or derive the power consumed by the load.</li>\n</ul>\n</li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/oXq3s7yv8LnVdt6omUp2NP/sbe-cc1-el-q3c/open/\">SbE CC1 EL Q3c (multisim.com)</a></p>\n<p><strong>[8 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part d) Frequency Response</strong></p>\n<p>The circuit shown has a capacitor and inductor in parallel which has been designed to be in resonance at a known frequency.&nbsp; The signal is measured across the load (R<sub>L</sub>).</p>\n<p style=\"text-align: center;\"></p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/SbE_CC1_Q3d.png\" width=\"548\" height=\"289\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Varibles:</strong> V<sub>S</sub> = {Q3d_V_S}V<sub>(RMS) </sub>, R<sub>L</sub> = {Q3d_R_L} k&Omega;<sub> </sub>C<sub>1</sub> = {Q3d_C1}&mu;F L<sub>1 </sub>= {Q3d_L1} mH</p>\n<p style=\"text-align: left;\">Using calculation or simulation, evaluate the performance of the circuit in a frequency range from 1Hz to 10kHz.&nbsp; Ensure that you:</p>\n<ul>\n<li>Explain what is meant by the term resonance and what role does it play in the circuit.</li>\n<li>Calculate or determine the frequency that the circuit will be in resonance.</li>\n<li>Plot and discuss the voltage relationship across the capacitor/inductor and the voltage across the load (R<sub>L</sub>).</li>\n<li>Discuss what application this type of circuit is useful for.</li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/KU6SMhmwZNVMdTVdsz6Liq/sbe-cc1-q3d/open/\" target=\"_blank\" rel=\"noopener\">*SbE CC1 Q3d (multisim.com)</a></p>\n<p></p>\n<p><strong>[12 Marks]</strong></p>"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always"}, {"name": "ElQ2 - Steady State & Step Response  - Randomised Variables Only", "extensions": [], "custom_part_types": [], "resources": [["question-resources/SbE_CC1_Q2c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2c.png"], ["question-resources/SbE_CC1_Q2b_aIYsTQF.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2b_aIYsTQF.png"], ["question-resources/SbE_CC1_Q2d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2d.png"], ["question-resources/SbE_CC1_Q2a.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2a.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}], "tags": [], "metadata": {"description": "<p>Question covering DC and Step response circuits</p>", "licence": "All rights reserved"}, "statement": "<h1 style=\"text-align: center;\">Steady State &amp; Step Response</h1>", "advice": "<p>See Spread Sheet</p>", "rulesets": {}, "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true}, "constants": [], "variables": {"Q2b_R3": {"name": "Q2b_R3", "group": "Ungrouped variables", "definition": "q2b_rs1", "description": "<p>M</p>\n<p></p>", "templateType": "anything", "can_override": false}, "Q2b_Resistivity": {"name": "Q2b_Resistivity", "group": "Ungrouped variables", "definition": "random(640 .. 640#10)", "description": "<p>Resistivity of Silicon (&Omega;m)</p>", "templateType": "randrange", "can_override": false}, "Q2b_VS": {"name": "Q2b_VS", "group": "Ungrouped variables", "definition": "random(9 .. 12#1)", "description": "<p>Supply Voltage V</p>", "templateType": "randrange", "can_override": false}, "Q2b_R1": {"name": "Q2b_R1", "group": "Ungrouped variables", "definition": "random(4000000 .. 7000000#1000000)", "description": "<p>Resistance of R<sub>1</sub> in M&Omega;</p>", "templateType": "randrange", "can_override": false}, "Q2b_R2": {"name": "Q2b_R2", "group": "Ungrouped variables", "definition": "Q2b_R1", "description": "", "templateType": "anything", "can_override": false}, "Q2b_A1": {"name": "Q2b_A1", "group": "Ungrouped variables", "definition": "random(1 .. 2#1)", "description": "<p>Cross Sectional Area mm<sup>2</sup></p>", "templateType": "randrange", "can_override": false}, "Q2b_l1": {"name": "Q2b_l1", "group": "Ungrouped variables", "definition": "random(10 .. 10#1)", "description": "<p>length pf gauge mm</p>", "templateType": "randrange", "can_override": false}, "Q2b_Volume_of_Sample": {"name": "Q2b_Volume_of_Sample", "group": "Ungrouped variables", "definition": "dec(q2b_a1/1000000)*dec(Q2b_l1/1000)\n", "description": "", "templateType": "anything", "can_override": false}, "Q2b_l2": {"name": "Q2b_l2", "group": "Ungrouped variables", "definition": "random(10.1 .. 10.2#0.1)", "description": "<p>Length of sample after load is applied (mm)</p>", "templateType": "randrange", "can_override": false}, "Q2b_A2": {"name": "Q2b_A2", "group": "Ungrouped variables", "definition": "siground(dec((Q2b_Volume_of_Sample/(Q2b_l2/1000))*1000000),4)\n", "description": "<p>Cross Sectional Area of Guage when load is applied mm<sup>2</sup></p>", "templateType": "anything", "can_override": false}, "Q2b_RS1": {"name": "Q2b_RS1", "group": "Ungrouped variables", "definition": "siground(dec((Q2b_Resistivity*(Q2b_l1/1000))/(Q2b_a1/1000000)),4)\n", "description": "", "templateType": "anything", "can_override": false}, "Q2b_RS2": {"name": "Q2b_RS2", "group": "Ungrouped variables", "definition": "siground(dec((Q2b_Resistivity*(Q2b_l2/1000))/(Q2b_a2/1000000)),4)", "description": "", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["Q2b_Resistivity", "Q2b_VS", "Q2b_R1", "Q2b_R2", "Q2b_R3", "Q2b_A1", "Q2b_l1", "Q2b_Volume_of_Sample", "Q2b_l2", "Q2b_A2", "Q2b_RS1", "Q2b_RS2"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part a. Circuit Symbols</strong></p>\n<p>For each of the symbols shown in the table, state the name and function of the device:&nbsp;</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q2a.png\" alt=\"Circuit Symbols\" width=\"376\" height=\"297\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p><strong>[4 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part b. Wheatstone Bridge Calculation</strong></p>\n<p>A Wheatstone Bridge is used to measure the change of resistance before &amp; while a load is applied to a gauge block made of silicon material with resistivity &rho; = {Q2b_Resistivity}&Omega;m.</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q2b_aIYsTQF.png\" alt=\"Wheatstone Bridge and Strain Gauge\" width=\"953\" height=\"378\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Varibles:&nbsp;</strong> V<sub>S</sub> = {Q2b_VS} V, R<sub>1</sub> = {siground({Q2b_R1}/1000000,2)} M&Omega;, &nbsp;R2 = {siground({Q2b_R2}/1000000,2)} M&Omega;, R3 = {siground({Q2b_R3}/1000000,2)} M&Omega;</p>\n<p></p>\n<p>The dimensions of the gauge <strong>before</strong> the load is applied are: Cross Sectional Area, A<sub>1</sub> &nbsp;= {Q2b_A1} mm<sup>2</sup>, length, l<sub>1</sub> = {Q2b_l1} mm.&nbsp; &nbsp;</p>\n<p>The dimensions of the gauge <strong>when</strong> the load is applied are: Cross Sectional Area, A<sub>2</sub>&nbsp;= {Q2b_A2} mm<sup>2</sup>, length, l<sub>2</sub> = {Q2b_l2} mm.&nbsp; &nbsp;</p>\n<ul>\n<li>Calculate the resistance (R<sub>S1</sub>) of the gauge <strong>before</strong> the load is applied.</li>\n<li>Calculate/determine the reading of <strong>V<sub>OUT</sub> </strong>for R<sub>S1</sub> &nbsp;</li>\n<li>Calculate the resistance (R<sub>S2</sub>) of the gauge <strong>when</strong> the load is applied.</li>\n<li>Calculate/determine the reading of <strong>V<sub>OUT</sub> </strong>for R<sub>S2</sub> &nbsp;</li>\n</ul>\n<p>SPICE circuit suitable for analysis:&nbsp; <a href=\"https://www.multisim.com/content/5LW69gJc6FJ3goGTgdhCsg/sbe-cc1-q1b/open/\">SbE CC1 Q1b (multisim.com)</a></p>\n<p><strong>[6 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part c. Step Response</strong></p>\n<p>The circuit shows a Resistor and Capacitor Network as well as the charge/discharge plots of the Capacitor when the switch is closed and opened.</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q2c.png\" width=\"930\" height=\"286\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Varibles:</strong> V<sub>S</sub> = {5} V, V<sub>B</sub> = {2.5} V t<sub>ON </sub>={50} ms, t<sub>OFF </sub>={200} ms C<sub>1</sub> ={10} &mu;F , R<sub>1</sub> = {10} k&Omega;, R<sub>2</sub> = {2} k&Omega;</p>\n<p>&nbsp;</p>\n<p>Explain what is happening in the circuit.&nbsp; What is the relationship between the voltage across and current through the Capacitor.</p>\n<p>SPICE circuit suitable for analysis: <a href=\"https://www.multisim.com/content/9rW4rVU7peuxbZD6f2JvAk/sbe-cc1-q2c/open/\">SbE CC1 Q2c (multisim.com)</a></p>\n<p><strong>[8 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part d. Circuit Analysis</strong></p>\n<p>The circuit shown is for a simple &lsquo;No Volt Release&rsquo; circuit configuration which is used as a safety feature on electrical equipment:</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q2d.png\" alt=\"No Volt Release\" width=\"429\" height=\"395\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p>Analyse the operation of this circuit for the intended purpose. Ensure that you:</p>\n<ul>\n<li>Explain how the circuit functions including the function of the individual components.</li>\n<li>Identify any limitations of the circuit.</li>\n<li>Suggest improvements and/or augmentations to enhance the function.</li>\n</ul>\n<p>SPICE circuit suitable for analysis: <a href=\"https://everycircuit.com/circuit/5431791347040256/no-volt-release\">EveryCircuit - No Volt Release</a></p>\n<p>[12 Marks]</p>"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always"}, {"name": "ElQ4 - Electromechanical Application & Control - Randomised Variables Only", "extensions": [], "custom_part_types": [], "resources": [["question-resources/SbE_CC1_Q4a.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4a.png"], ["question-resources/SbE_CC1_Q4b.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4b.png"], ["question-resources/SbE_CC1_Q4c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4c.png"], ["question-resources/SbE_CC1_Q4d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4d.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}], "tags": [], "metadata": {"description": "<p>Question covering Solenoids, Motors and Semiconductors</p>", "licence": "All rights reserved"}, "statement": "<h1 style=\"text-align: center;\">Electromechanical&nbsp; Application &amp; Control</h1>", "advice": "<p>See Spreadsheet</p>", "rulesets": {}, "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true}, "constants": [], "variables": {"Q4b_L1": {"name": "Q4b_L1", "group": "EL Q4b", "definition": "random(0.05 .. 0.05#1)", "description": "<p>Solenoid Inductace (L<sub>1</sub>)</p>", "templateType": "randrange", "can_override": true}, "Q4b_R1": {"name": "Q4b_R1", "group": "EL Q4b", "definition": "random(1 .. 2#0.2)", "description": "<p>Solenoid Resistance (&Omega;)</p>", "templateType": "randrange", "can_override": false}, "Q4b_Solenoid_length": {"name": "Q4b_Solenoid_length", "group": "EL Q4b", "definition": "random(10 .. 10#1)", "description": "<p>The length (<em>l </em>) of the solenoid in mm</p>", "templateType": "randrange", "can_override": false}, "Q4b_Armature_Gap": {"name": "Q4b_Armature_Gap", "group": "EL Q4b", "definition": "random(2 .. 2#1)", "description": "<p>the gap (g) between the solenoid and the armature in mm&nbsp;</p>", "templateType": "randrange", "can_override": false}, "Q4b_F_gen": {"name": "Q4b_F_gen", "group": "EL Q4b", "definition": "random(2.3 .. 2.3#1)", "description": "<p>Force (F) generated by the solenoid in N</p>", "templateType": "randrange", "can_override": false}, "Q4c_Duty_cycle": {"name": "Q4c_Duty_cycle", "group": "EL Q4c", "definition": "random(25 .. 60#5)", "description": "<p>PWM Duty Cycle</p>", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [{"name": "EL Q4a", "variables": []}, {"name": "EL Q4b", "variables": ["Q4b_L1", "Q4b_R1", "Q4b_Solenoid_length", "Q4b_Armature_Gap", "Q4b_F_gen"]}, {"name": "EL Q4c", "variables": ["Q4c_Duty_cycle"]}, {"name": "EL Q4d", "variables": []}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part a) Semiconductor Circuit Symbols</strong></p>\n<p>For each of the symbols shown in the table, state the name of the device and the function:</p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/SbE_CC1_Q4a.png\" alt=\"Semiconductor Circuit Symbols\" width=\"361\" height=\"283\"/></p>\n<p></p>\n<p><strong>[4 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part b) Solenoid Calculation</strong></p>\n<p>The figure shows a solenoid electromagnet circuit compromising the inductance of the coil and the series resistance.&nbsp; It is being energised by a battery.&nbsp; The switch has been closed for {100*Q4b_L1*Q4b_R1}s.&nbsp;</p>\n<p><img src=\"resources/question-resources/SbE_CC1_Q4b.png\" alt=\"Solenoid Circuit &amp; Equations\" width=\"598\" height=\"405\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p>The measured Inductance (<em>L</em>) of the solenoid is {siground(dec(Q4b_L1*1000),4)}mH and the Resistance is {Q4b_R1}&Omega;.&nbsp; The length (<em>l </em>) of the solenoid is {Q4b_Solenoid_length}mm and the gap (g) between the solenoid and the armature is {Q4b_Armature_Gap}mm.&nbsp;</p>\n<ul start=\"2\">\n<li>What is the current flowing in the inductor to generate a force of {Q4b_F_gen}N?</li>\n<li>For this current, what is the magnitude of the supply voltage V<sub>S</sub>?</li>\n</ul>\n<p><strong>[6Marks]</strong></p>\n<p>SPICE circuit suitable for analysis:&nbsp; <a href=\"https://www.multisim.com/content/E2QfJxUG22bLWe5y4FxNZP/sbe-cc1-el-q4b/open/\">SbE CC1 EL Q4b (multisim.com)</a></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part c) DC Motor Driver</strong></p>\n<p>The figure shows a circuit used to drive a Permanent Magnet DC Motor.&nbsp;&nbsp;&nbsp;</p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/SbE_CC1_Q4c.png\" alt=\"DC motor PWM driver\" width=\"444\" height=\"477\"/></p>\n<p><strong>Circuit Variables:</strong></p>\n<p>V<sub>CC</sub>=12V; V<sub>PWM</sub>=5V, 1kz, {25}% Duty Cycle; R<sub>1</sub> = 1k&Omega;; &nbsp;&nbsp;Motor Armature Resistance R<sub>A</sub> = 1k&Omega;; Motor Inductance L<sub>A</sub> = 100&mu;H; &nbsp;Diode Reverse Breakdown Voltage = 1kV.&nbsp;</p>\n<p>&nbsp;</p>\n<p>Explain the operation of the circuit.&nbsp; Ensure that you:&nbsp;</p>\n<ul>\n<li>Explain the link between the V<sub>PWM</sub> and the operation of the MOSFET.&nbsp;</li>\n<li>Explain the purpose and operation of the protection diode.&nbsp;</li>\n</ul>\n<p>&nbsp;</p>\n<p>SPICE circuit suitable for analysis:&nbsp; <a href=\"https://www.multisim.com/content/CDvBp3EnuT6aozinSVAw9P/sbe-cc1-el-q4c/\">SbE CC1 EL Q4c - Multisim Live</a></p>\n<p>&nbsp;</p>\n<p><strong>[8 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part d) Servo Vs Stepper Motor</strong></p>\n<p>Simplified models of Servo Motor Control and a Stepper Motor Control are shown in shown in the figures below:&nbsp;</p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/SbE_CC1_Q4d.png\" alt=\"Stepper vs Servo\" width=\"734\" height=\"413\"/></p>\n<p>One of these technologies provides precision position control and the other provides precision motion control.&nbsp; Compare the two technologies highlighting the advantages and disadvantages of each and for each suggest a suitable medical application that they would be best suited for.&nbsp;</p>\n<p>Ensure that you give a brief description of how each motor control type functions.&nbsp;</p>\n<p>[<strong>12 Marks]</strong></p>"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always"}]}], "allowPrinting": true, "navigation": {"allowregen": false, "reverse": false, "browse": false, "allowsteps": false, "showfrontpage": false, "showresultspage": "never", "navigatemode": "sequence", "onleave": {"action": "none", "message": ""}, "preventleave": false, "typeendtoleave": false, "startpassword": "", "allowAttemptDownload": false, "downloadEncryptionKey": ""}, "timing": {"allowPause": true, "timeout": {"action": "none", "message": ""}, "timedwarning": {"action": "none", "message": ""}}, "feedback": {"showactualmark": false, "showtotalmark": false, "showanswerstate": false, "allowrevealanswer": false, "advicethreshold": 0, "intro": "<h2><span style=\"text-decoration: underline;\">Electronics Written Assessment Instructions</span></h2>\n<p></p>\n<ul>\n<li>Ensure you have typed your UWE Candidate No. into the Sheet ID.&nbsp;</li>\n<li>If you have forgotten to type you UWE Candidate No. in, click the \"generate different sheets\" button and type the number into the \"start with ID box\"</li>\n<li>Please tick the \"page break between questions\" radio button.</li>\n<li>Click the \"print this sheet button\" to generate a pdf of the paper (with your UWE Candidate NO. on).</li>\n<li>For your submission, you will need to submit the pdf of this paper and a copies of your answer sheets.&nbsp;&nbsp;</li>\n</ul>\n<p></p>\n<ul>\n<li>You have 4 hours from when you start the assessment to submit your answers.&nbsp;</li>\n<li>Refer to the <a href=\"https://uweacuk.sharepoint.com/:w:/r/sites/USSKL6-30-1_23sep_1Members/Shared%20Documents/SbE%20Combined%20Assessment/USSKL6-30-1%20CC1R%20202407%20-SbE%20RESIT%20Written%20Assessment%20%20Guidelines%20v.2.docx?d=wc2889747ca08499093eb8711b6565090&amp;csf=1&amp;web=1&amp;e=M5U3XX\" target=\"_blank\" rel=\"noopener\">guidance document</a> for more detail on the Assessment.</li>\n<li>Candidates should answer 2 out of the 3 questions &nbsp;</li>\n</ul>\n<p>&nbsp;</p>\n<p>Ver 1.1</p>", "end_message": "", "reviewshowscore": false, "reviewshowfeedback": false, "reviewshowexpectedanswer": false, "reviewshowadvice": false, "results_options": {"printquestions": true, "printadvice": true}, "feedbackmessages": []}, "diagnostic": {"knowledge_graph": {"topics": [], "learning_objectives": []}, "script": "diagnosys", "customScript": ""}, "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}], "extensions": [], "custom_part_types": [], "resources": [["question-resources/SbE_CC1_Q3ai.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3ai.png"], ["question-resources/SbE_CC1_Q3b.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3b.png"], ["question-resources/SbE_CC1_Q3d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3d.png"], ["question-resources/SbE_CC1_Q3c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q3c.png"], ["question-resources/SbE_CC1_Q2c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2c.png"], ["question-resources/SbE_CC1_Q2b_aIYsTQF.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2b_aIYsTQF.png"], ["question-resources/SbE_CC1_Q2d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2d.png"], ["question-resources/SbE_CC1_Q2a.png", "/srv/numbas/media/question-resources/SbE_CC1_Q2a.png"], ["question-resources/SbE_CC1_Q4a.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4a.png"], ["question-resources/SbE_CC1_Q4b.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4b.png"], ["question-resources/SbE_CC1_Q4c.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4c.png"], ["question-resources/SbE_CC1_Q4d.png", "/srv/numbas/media/question-resources/SbE_CC1_Q4d.png"]]}